Drops an existing table.
If the DELETE TOPIC clause is present, the table's source topic is
marked for deletion. If the topic format is
corresponding schema is deleted in the schema registry. Topic deletion is
asynchronous, and actual removal from brokers may take some time to
DELETE TOPIC will not necessarily work if your Kafka cluster is
configured to create topics automatically with
auto.create.topics.enable=true. We recommended checking after a few
minutes to ensure that the topic was deleted.
If the IF EXISTS clause is present, the statement doesn't fail if the table doesn't exist.